McAfee updates

Even though that im a new Nod supporter, ive been playing a little with McAfee Virusscan 7,0.
Does Mcafee only realease updates once a week or so
In my opinion such a thing should happen more often.
I know that Norton have their liveupdate running once a week, but you have the possiblety to manual download daily updates.
Even Panda (actually a good scanner) realese daily updates, and in the weekend too.